173 
On Irrigation in Tasmania . 
Thus the first cost would be not quite £3 10s. per acre, 
and the annual cost, including interest, &c., £1 6s. per 
acre, for land irrigated throughout the summer. 
In this estimate I suppose the engine to be of the 
common construction, and purchased in the colony; 
also that, besides a sum for repairs, the whole engine and 
boiler is replaced after seven years. In the cost of fuel, 
it is supposed that it is brought from the immediate 
neighbourhood by carts and bullocks belonging to the 
farm. If the engine is sent for from England, the cost 
will be less, but a year will be lost. 
If, however, the engine upon Avery’s principle, which 
was lately tried in Hobart, should be brought into 
use for this purpose, the expense would be greatly re¬ 
duced ; the first cost would be £150, including putting 
up, and the annual expense would then be about 18s. 
per acre, and first cost about £1 7s. per acre. The ex¬ 
pense of management would also be reduced, because'the 
engine is so simple that any intelligent labourer could 
take charge of it .—(Sec postscript.) 
Pumping by Bullocks .—A pair of bullocks could raise 
about three-fourths of the quantity that could be raised 
by what is called a horse power in steam machinery, or 
they would water eleven acres per day, working eight 
hours. I have not the means of obtaining accurate data 
for the cost of bullock labour, but any land-owner can 
correct the following estimate if it is wrong :— 
£ 
Cost of four pair of bullocks. 120 
Machinery . 100 
First outlay.... £220 
